All necessary boiler controls and secondary plumbing are in place and pre wired, and the vessels easily fit through a 30″ doorway, resulting in a very quick start-up. Each vessel contains a 60 foot copper coil through which the domestic hot water is circulated. This coil is surrounded by the hot boiler water, which transfers heat to the coil. Firing rates for the Series 300 Domestic Hot Water are available from 210,000 Btu/hr to 375,000 Btu/hr. However, many millions of Btu’s can be delivered by creating an efficient, fully modular system of many indirect water heaters operated by our computerized control panel.

Standard features include nationally known parts and controls that are available at most supply houses, allowing for quick and easy repair and maintenance, which can dramatically reduce down time.

Design

The Series 300 Domestic Hot Water Boiler is an indirect water heater manufactured to exceed ASME Section IV standards and typically is used to provide supply temperatures from the coil of between 140-180°F, yet can accept extremely low return temperatures (below 100°F) without shocking the boiler. The temperature of the coil water is impacted by the temperature of the Space Heating side because the coil is immersed in that water. These vessels contain 37 vertical firetubes, each of which is 1½” diameter, each fitted with a high-efficiency turbulator for maximum heat transfer. The combustion chamber is fully water-backed, with burners that are UL listed. The vessel capacity is 35 gallons with a heating surface of 34 sq. ft. This Indirect Water Heater qualifies as a Category I gas appliance with industry standard controls wired to NEC specifications.

Safety

A well-made, heavy vessel is naturally a safer boiler. But ZHONGYUAN Boiler Indirect Water Heaters also have a firebox design that is completely backed by water, along with extra safety controls on the boiler that results in a very safe and secure package.